I was thinking of first looking at the capas in the analogue section. My main problem is how you get the analogue board out . I figure you go in from underneath and remove a torx screw holding the board in place. Is there much more dismantling to be done , or is there a special way of removing the card ?

Now swapped all the remaining caps from the decoder board for oscons. They were all 22uF/35v ( B&O CDX says there 40v) However none see a voltage greater than -18v. There is alsu one 1uF/35v cap too. I swapped in 22uF/20v oscons which fit well and a 1uF/20v. sorry for the poor picture but the oscons are the violet/blue caps

Sound is sweeter I'd say

Remaining tweak might be to add some ferrites to the 3 green inductors you can see in the picture. Need to device a means where they don't short with the groundplane.